WakeWorld

WakeWorld (http://www.wakeworld.com/forum/index.php)
-   Boats, Accessories & Tow Vehicles (http://www.wakeworld.com/forum/forumdisplay.php?f=3183)
-   -   jl hd 750.1 amp for sale (http://www.wakeworld.com/forum/showthread.php?t=799439)

Jake 08-07-2013 6:50 AM

jl hd 750.1 amp for sale
 
Selling my jl audio hd 750.1 amp. Used this to power a set of rev 10s. Amp is in perfect condition. .

350 obo plus shipping

text me for pics
214 738 7983

murphy_smith 08-07-2013 7:57 AM

Is this full range amp or the wide range amp. They changed in the past year?

Jake 08-07-2013 8:43 AM

Its a mono amp is all I know

txpilot83 08-07-2013 2:54 PM

The JL750.1 should be full range. Wouldn't work well with REV10s if it was mono only.

murphy_smith 08-07-2013 3:54 PM

Mark you are incorrect....JL just changed that amp up from a full range to a wide range about a year.

It makes a difference

murphy_smith 08-07-2013 4:01 PM

The full range amp which they no longer make had a freq resp from 5hz to 30khx

The new wide range amp they they sell has a freq resp from 6hz to 8 khz

I have spoken to several dealers who have damaged nice tower speakers with the new amp....best be used for sub application now.

murphy_smith 08-07-2013 4:29 PM

I guess I should say that I have heard...can not be confirmed that those amps are causing the issues....may just be that the dealer wanted to sell more amps as well.

Could be rumor

Jake 08-07-2013 4:30 PM

I bought the amp last December from car toys

david_e_m 08-07-2013 4:55 PM

Quote:

Originally Posted by murphy_smith (Post 1837814)
The full range amp which they no longer make had a freq resp from 5hz to 30khx

The new wide range amp they they sell has a freq resp from 6hz to 8 khz

I have spoken to several dealers who have damaged nice tower speakers with the new amp....best be used for sub application now.

Murphy,
The dealers you spoke with are giving you some very bad information. There is no increased risk when using this amplifier with fullrange speakers. The top end roll-off is caused by the inductors used on the final stage of the output section used to filter out the analog switching frequency which is many times beyond the audio bandwidth. All fullrange Class D amplifiers use these filter inductors. Even many triple darlington Class AB amplifiers use a similar inductor in the final output stage.
The JL Audio HD1200/1 has a more limited bandwidth than the recently revised HD750/1 although the HD750/1 retains the same bandwidth rating as the HD1200/1. Many so-called Class D amplifiers and triple darlington Class AB amplifiers have a similar top end range but you are not aware of it and you can't hear it....other than the placebo effect. The difference is the position held by JL Audio and their very conservative approach. If some off-the-wall product stretches their specs, no one cares. On the other hand, if someone tests a JL Audio product, even if out of context, and it doesn't exceed all JL Audio specs then it would be a major issue receiving major criticism. So, in this case, JL Audio has been extra conservative.
We tested the latest version of the HD750/1. Very simple test. Measure the output voltage at various frequencies at the same gain. Convert voltage to decibles. It is down a couple of dB at 20 kHz into a 4-ohm load with a slightly more aggressive roll-off into a 2-ohm load. You can't hear 20 kHz in a perfect quiet room let alone outside....no way. Plus, there is no way a 1.5" to 2" tweeter diaphram that is loaded into a compression chamber (typical HLCD) is going to reproduce 20 kHz....no way.
The risk to speakers comes from the fact that this is a very powerful amplifier and beyond the continuous thermal capacity of the speakers it is being used with.
Earmark uses an HD750/1 on each Rev410 plus an HD750/1 on each Rev10 on display. It is so loud it will make you cringe on rimshots and really dynamic passages, but it is always warm and clean, and they have never burned a display speaker to date.

David

murphy_smith 08-07-2013 6:23 PM

Thanks David :)

One day I will share with you where I heard this info...person was very adamant he was correct!

Gotmods 08-07-2013 10:19 PM

Quote:

Originally Posted by murphy_smith (Post 1837853)
Thanks David :)

One day I will share with you where I heard this info...person was very adamant he was correct!

You need to slap the "several" dealers who told you this, lol! Nice thread bomb, my uninformed dealer told me it wouldn't work either, I can say from first hand experience it does!

I bet it is full range due to its age, but either way its a great amp for a pair of rev 10's, GLWS.

david_e_m 08-08-2013 7:38 AM

Quote:

Originally Posted by murphy_smith (Post 1837853)
Thanks David :)

One day I will share with you where I heard this info...person was very adamant he was correct!

They always are.

murphy_smith 08-08-2013 7:48 AM

Quote:

Originally Posted by Gotmods (Post 1837880)
You need to slap the "several" dealers who told you this, lol! Nice thread bomb, my uninformed dealer told me it wouldn't work either, I can say from first hand experience it does!

I bet it is full range due to its age, but either way its a great amp for a pair of rev 10's, GLWS.


Yeah it was poor thread bomb...

Take care Bobby ;)

Truekaotik 08-08-2013 7:50 AM

It wasn't me!! David is correct...

Houstonshark 08-08-2013 8:47 AM

The only way they blew the Rev10's with a 750/1 is if they turned the 'volume control' on the amp up too high and listened to the speakers for too long while they were 'extorting'.

Gotmods 08-08-2013 8:37 PM

Quote:

Originally Posted by murphy_smith (Post 1837934)

Take care Bobby ;)

I take it any way I can get it!


All times are GMT -7. The time now is 4:34 PM.